Abstract:
:Regulation of the hypothalamic-pituitary-thyroid (HPT) axis is dependent upon the secretion of thyrotropin-releasing hormone (TRH), a tripeptide originating in the hypothalamic paraventricular nucleus (PVN). These so-called hypophysiotropic neurons are under feedback inhibition by circulating levels of thyroid hormone, mediated through interactions with the beta2 thyroid hormone receptor (TRbeta2) and competition with the phosphorylated form of cyclic adenosine 5'-monophosphate response element binding protein (CREB) for a multifunctional binding site in the TRH gene. The non-thyroidal illness syndrome, characterized by low circulating thyroid hormone levels yet suppression of TRH gene expression in hypophysiotropic neurons, is due to alteration in the regulatory factors that modulate TRH gene expression to result in central hypothyroidism. These factors include alpha melanocyte-stimulating hormone (alphaMSH) and cocaine- and amphetamine-regulated transcript (CART), and agouti-related protein (AGRP) and neuropeptide Y (NPY), substances co-produced by distinct populations of leptin-responsive neurons in the hypothalamic arcuate nucleus. Through monosynaptic projections from arcuate nucleus neurons to hypophysiotropic TRH neurons, these factors contribute to suppression of HPT axis during fasting and starvation by exerting opposing actions on the TRH gene, altering the sensitivity for feedback inhibition by thyroid hormone. In contrast, central hypothyroidism associated with infection may be due to upregulation of type 2 deiodinase activity in tanycytes, specialized glial cells that line the infralateral walls and floor of the third ventricle. Through tanycyte-cerebrospinal fluid, -vascular or -neuronal associations, these cells may lead to inhibition of TRH gene expression in hypophysiotropic neurons by increasing local triiodothyronine production.
journal_name
J Endocrinol Investjournal_title
Journal of endocrinological investigationauthors
Lechan RM,Fekete Ckeywords:
subject
Has Abstractpub_date
2004-01-01 00:00:00pages
105-19issue
6 Suppleissn
0391-4097issn
1720-8386journal_volume
27pub_type
杂志文章,评审abstract::Central hypothyroidism (CH) is a rare cause of hypothyroidism characterized by a defect of thyroid hormone production due to an insufficient TSH stimulation. CH can be congenital in the case of genetic defects or acquired in the case of lesions affecting either pituitary or hypothalamus. Diagnosis is usually made on a...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章,评审
doi:
更新日期:2008-09-01 00:00:00
abstract::During a systematic study of women with idiopathic galactorrhea, we observed several patients with normal random serum prolactin (PRL) levels and normal menses, but abnormal sellar tomograms characteristic of a pituitary adenoma. To test the hypothesis that these women might have intermittent PRL hypersecretion, we st...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03348450
更新日期:1984-10-01 00:00:00
abstract:OBJECTIVE:Subcutaneous insulin absorption is one of the key factors affecting glycemic control in patients with diabetes mellitus under insulin therapy. Insulin-induced subcutaneous lipohypertrophy has been reported to impair insulin regular absorption and hence glycemic control. So far, lipohypertrophy diagnosis has o...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/s40618-017-0675-1
更新日期:2017-10-01 00:00:00
abstract:PURPOSE:The objectives were to assess the prevalence of overweight/obesity, abdominal obesity and metabolic syndrome (MetS), and to evaluate the characteristics of the metabolically unhealthy lean (MUHL) and metabolically healthy overweight/obese (MHO) phenotypes in a Romanian population-based sample from the PREDATORR...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/s40618-016-0470-4
更新日期:2016-09-01 00:00:00
abstract::The authors report the profiles of luteinizing hormone (LH), estradiol (E2), progesterone (P) and androstenedione (A) in some female pigs with altered plasma hormonal levels. Twenty cycles are described and 19 out of them are characterized by low plasma P in luteal phase of different etiology, at least as measured by ...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03350557
更新日期:1983-02-01 00:00:00
abstract::N-Methyl-D-Aspartate(NMDA)-sensitive glutamate receptors, are critically involved in the induction of the learning process. Activation of NMDA receptors by glutamate lead to massive influx of extracellular Ca2+, with ensuing activation of a variety of Ca(2+)-dependent enzymes, including protein kinase C. This triggers...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03348959
更新日期:1993-12-01 00:00:00
abstract::A 36-year-old non-pregnant woman presented with a four-month history of progressive visual deterioration and amenorrhea. The latest gestation was 6 years earlier. Hormonal study revealed central diabetes insipidus, hypopituitarism, and slightly increased prolactin level. Ophthalmologic examination showed bilateral hem...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03343842
更新日期:2001-03-01 00:00:00
abstract::The genetic factors determining bone mineral density (BMD) are not well characterized. Many studies have investigated the relationship between the fokI polymorphism of vitamin D receptor (VDR) gene in diverse populations and gender, resulting in conflicting outcomes. Because peak bone mass in men is closely related to...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03347571
更新日期:2005-10-01 00:00:00
abstract::Antithyroid drugs may be proposed as the firstline therapy for hyperthyroidism due to Graves' disease since some patients undergo prolonged remission after drug withdrawal. On the other hand, some studies, though controversial, indicated that methimazole (MMI) has some immunomodulating activity. We retrospectively ana...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03346433
更新日期:2008-10-01 00:00:00
abstract::LATS containing sera and a number of Graves' disease sera stimulated T4 release from mouse thyroids in vitro as determined by RIA, thus confirming the presence of a thyroid hormone releasing factor in sera of thyrotoxic patients. The pattern of stimulation was similar to that previously shown for TSH in terms of T4 re...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03350973
更新日期:1978-10-01 00:00:00
abstract::Reduced cardiac mass and performances are present in GH deficiency and are counteracted by rhGH replacement. GH and IGF-I possess specific myocardial receptors and have been reported able to exert an acute inotropic effect. Synthetic GH secretagogues (GHS) possess specific pituitary and hypothalamic but even myocardia...
journal_title:Journal of endocrinological investigation
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/BF03343555
更新日期:1999-04-01 00:00:00
abstract:BACKGROUND:Vitamin D exerts pleiotropic effects and few studies are available in the Italian population. AIM:Aim of our study was to evaluate vitamin D status in children living in Northern Italy. METHODS:We studied vitamin D levels in a population of 113 normal weight (NW) and 444 obese (OB) children, prepubertal an...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/s40618-014-0108-3
更新日期:2014-09-01 00:00:00
abstract:INTRODUCTION:Growth hormone resistance defines several genetic (primary) and acquired (secondary) pathologies that result in completely or partially interrupted activity of growth hormone. An archetypal disease of this group is the Laron-type dwarfism caused by mutations in growth hormone receptors. The diagnosis is ba...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章,评审
doi:10.1007/s40618-015-0327-2
更新日期:2016-01-01 00:00:00
abstract:BACKGROUND:Protein tyrosine phosphatase (PTP)- 1B, encoded by the PTPN1 gene, negatively regulates insulin signaling by dephosphorylating the phosphotyrosine residues of the insulin receptor kinase activation segment. Several rare single nucleotide polymorphisms (SNP) have been linked to diseases accompanying insulin r...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03346629
更新日期:2010-07-01 00:00:00
abstract::The role of androgens in human sexuality as regards the mechanism of erection and the pathogenesis of impotence is under debate. In addition, it is difficult to define the psychosocial impact of both hypogonadism and androgen replacement. However, sexual hormones largely influence mood, well-being, and quality of life...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章,评审
doi:
更新日期:2005-01-01 00:00:00
abstract::A study of the effects of salmon calcitonin (sCT) infusion on blood sugar and serum insulin levels under basal conditions and after intravenous glucose load in normal subjects is reported. Under basal conditions, a 30 min infusion of sCT at approximately a rate of 1 U/min produced a highly significant increase in the ...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03349315
更新日期:1979-04-01 00:00:00
abstract::Gonadal sex hormones may account for the sexual dimorphism in the immune response and for the greater incidence of autoimmune disease in females. We have previously reported the presence of progesterone (P) deficiency in female patients with thyroid and ovarian autoimmune disease. In this context, the hormonal profile...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03347683
更新日期:1993-09-01 00:00:00
abstract:BACKGROUND:Immune dysfunction is very common in diabetes mellitus (DM). However, there is no evidence whether such immune dysfunction can influence the development of DM, especially the development of diabetic nephropathy (DN). AIM:To investigate the influence of absence of T cells on DN. MATERIALS AND METHODS:Balb/c...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.3275/8962
更新日期:2013-12-01 00:00:00
abstract:BACKGROUND:Agents capable of increasing radioiodine concentration by stimulating the sodium/iodide symporter (NIS) expression have been extensively investigated for the treatment of certain well-differentiated breast cancers. AIM:In this study, we analyzed the regulation of the NIS and lactoperoxidase (LPO) gene expre...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03346542
更新日期:2010-01-01 00:00:00
abstract::Thyrotropin binding characteristics and adenylate cyclase (AC) activity of thyroid plasma membranes were studied in 52 tissues from normal and diseased human thyroids. Data from normal glands, Graves' goiters, non toxic multinodular goiters and nodular and perinodular tissue of toxic nodular goiters show the same basa...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03350977
更新日期:1978-10-01 00:00:00
abstract::Total and free thyroid hormones (T3, T4, FT3, FT4), TSH and PRL were determined in basal conditions and after stimulation with TRH in 32 patients affected by autonomous thyroid nodules before and after nodulectomy and in 24 control subjects. Only 7 patients were clinically thyrotoxic and thyroid hormone concentrations...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03350607
更新日期:1983-06-01 00:00:00
abstract::Human thyroid blood flow rate (TBF) was measured during operations by electromagnetic flowmetry in 75 euthyroid patients with normal thyroid tissue, nodular goiter, or solitary adenoma, and in 22 hyperthyroid patients with diffuse or nodular goiter. Blood flow rate was measured in one to four of the thyroid arteries. ...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03349454
更新日期:1981-07-01 00:00:00
abstract::Abnormalities of the gene encoding the sequence-specific DNA-binding protein, nuclear phosphorprotein p53, are among the most common genetic alterations observed in human cancers. A mutation of this tumor suppressor gene has been reported with a low prevalence in differentiated thyroid carcinomas, while the prevalence...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03347774
更新日期:1994-11-01 00:00:00
abstract::Sjögren's syndrome (SS) is an autoimmune epithelitis characterized by lymphocytic infiltration of exocrine glands and epithelia in multiple sites. One third of the patients present with peripheral nervous system involvement. We describe the case of a woman aged 62 affected by a peroneal nerve mononeuropathy with painf...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:
更新日期:2004-01-01 00:00:00
abstract:BACKGROUND:Testosterone deficiency might be associated with vitamin D levels in hypogonadal men, but it is not clear whether testosterone can affect vitamin D and fibroblast growth factor-23 (FGF23), either directly or indirectly via aromatization to estradiol. We aimed to investigate the role of testosterone on vitami...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/s40618-018-0875-3
更新日期:2019-01-01 00:00:00
abstract::Several cases of sporadic primary hyperparathyroidism in association with fibrous dysplasia of the bone have been reported in the English literature. Since fibrous dysplasia is a major feature and hyperparathyroidism is occasionally found in the McCune-Albright syndrome, we hypothesized that such cases may represent a...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03348018
更新日期:1997-10-01 00:00:00
abstract:UNLABELLED:ABSTRACT. Several data show that meal intake and nutritional status regulate circulating ghrelin concentrations in humans. Ghrelin mainly circulates in two different forms: octanoyl and des-octanoyl ghrelin. Most circulating ghrelin is des-octanoyl ghrelin which is considered inactive because it lacks endocr...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:
更新日期:2004-05-01 00:00:00
abstract:PURPOSE:The aim of this study was to determine whether the triglycerides and glucose (TyG) index is associated with the presence of metabolically obese normal-weight (MONW) phenotype and related cardiovascular risk factors. METHODS:Apparently healthy men and non-pregnant women aged 20-65 years were enrolled in a popul...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/s40618-020-01184-x
更新日期:2020-07-01 00:00:00
abstract::The differential diagnosis of an osteoblastic vertebral lesion (ivory vertebra) includes metastatic prostate cancer, lung cancer, lymphoma, osteosarcoma and Paget's disease. We report a case of a man who was initially diagnosed with Paget's disease on vertebral biopsy. He failed to respond to conventional bisphosphate...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03343770
更新日期:2000-09-01 00:00:00
abstract::We hereby present a rare variant of multiple endocrine neoplasia type 2A (MEN2A) associated with a rare skin disease primary cutaneous lichen amyloidosis and discrete malignant pheochromocytoma in both adrenal glands and pancreatic tail, and interestingly accompanied ganglioneuroma located in retroperitoneum in a 34-y...
journal_title:Journal of endocrinological investigation
pub_type: 杂志文章
doi:10.1007/BF03347557
更新日期:2005-09-01 00:00:00